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drm/vmwgfx: Fix invalid reads in fence signaled events 

commit a37ef7613c upstream.

Correctly set the length of the drm_event to the size of the structure
that's actually used.

The length of the drm_event was set to the parent structure instead of
to the drm_vmw_event_fence which is supposed to be read. drm_read
uses the length parameter to copy the event to the user space thus
resuling in oob reads.

Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Fixes: 8b7de6aa84 ("vmwgfx: Rework fence event action")
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-23566
Cc: David Airlie <airlied@gmail.com>
CC: Daniel Vetter <daniel@ffwll.ch>
Cc: Zack Rusin <zack.rusin@broadcom.com>
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: <stable@vger.kernel.org> # v3.4+
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425192748.1761522-1-zack.rusin@broadcom.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zack Rusin 2024-04-25 15:27:48 -04:00 committed by Greg Kroah-Hartman
parent 343081c21e
commit cef0962f2d
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
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@ -1066,7 +1066,7 @@ static int vmw_event_fence_action_create(struct drm_file *file_priv,
}
event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED;
event->event.base.length = sizeof(*event);
event->event.base.length = sizeof(event->event);
event->event.user_data = user_data;
ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);